Superconducting magnet system for nuclear magnetic resonance with high magnetic field and high degree of homogeneity of magnetic field

US8934950B2 · kind B2 · utility

Assignee

• Institute of Electrical Engineering, Chinese Academy of Sciences · CN

Inventors

• Qiuliang Wang · Beijing, CN
• Yinming Dai · Beijing, CN
• Baozhi Zhao · Beijing, CN
• Xinning Hu · Beijing, CN
• Luguang Yan · Beijing, CN
• Housheng Wang · Beijing, CN
• Shunzhong Chen · Beijing, CN

Key dates

• Filing date: Mar 3, 2011
• Grant date: Jan 13, 2015
• Expiry date: Jul 9, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/421
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A superconducting magnet system for nuclear magnetic resonance with a high magnetic field and a high degree of homogeneity of magnetic field is provided. The system comprises a main coil and a magnetic field homogeneity compensating coil having a combination of a forward current and a reverse current, and is composed of 24 superconducting coils formed by winding NbTi/Cu low-temperature superconducting wires. The system can produce a magnetic field of 9.4 T within a room-temperature space of 800 mm and can obtain a degree of non-homogeneity of magnetic field less than 0.1 ppm within a spherical volume of 300 mm. The system is equipped with a superconducting magnet inside, and a low-temperature vessel for liquid helium provides a low-temperature environment of 4K which is required for the normal operation of the superconducting magnet. A ferro-magnetic shielding system enables the system to have a good electromagnetic compatibility.